<html>
	<head>
		<title></title>
	</head>
	<body>
		<style type="text/css">
			.act div{
				list-style: none;
				font-size: 0;
				float: left;
				width: 50px;
				height: 250px;
				background: red;
				border: 1px solid black;
			}
			.act div:hover{
				width: 100px;
				height: 300px;
			}
		</style>
		<div class="act">
			<div></div>
			<div></div>
			<div></div>
			<div></div>
		</div>
	</body>
</html>